Coupling



FIG. 1 is a front perspective view of a coupling.

FIG. 2 is another front perspective view of the coupling of FIG. 1.

FIG. 3 is another front perspective view of the coupling of FIG. 1.

FIG. 4 is another front perspective view of the coupling of FIG. 1.

FIG. 5 is a side view of the coupling of FIG. 1.

FIG. 6 is a top or bottom view of the coupling of FIG. 1.

FIG. 7 is a front end view of the coupling of FIG. 1; and,

FIG. 8 is a rear end view of the coupling of FIG. 1.

The broken lines are directed to environment and are for illustrative purposes only; the broken lines form no part of the claimed design. 

CLAIM The ornamental design for a coupling, as shown and described. 